Feeding mechanism for sewing-machines.



M. HEMLEB.

resume MECHANISM FOR SEWING MACHINES.

APPLICATION FILED APR. 30' I915.

Patented Mar. 26,1918.

WITNESES: jaw! 4;

v 212E131 mmnnia, or ELIZABETH,

NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A.CORPORATION OF NEW JERSEY.

FEEDING- MECHANISM FOR SEWING-MACHINES.

Specification of Letters Eatent. Patented Mar. 26, iglfia Applicationfiled April 80, 1915. Serial No. 24,858.

To all whom it may concern:

Be it known that I, MARTIN HEMLEB, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,haveinvented certain new and useful Improvements in Feeding Mechanismfor Sewing-Machines, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to improvements in feeding mechanism for sewingmachines, and particularly to that class of feeding mechanism in whichtwo differentially-moving feeding members are employed to engage thework between their upper faces and the resser-foot or resser-feet. Theobject of the present invention is to provide means whereby the work maybe instantly relieved from the action of one feeding member during theoperation of the machine. I a The sewing machine frame comprises theusual bed'and overhanging head, the latter supporting the needle andpresser-bars. The driving shaft is journaled in the bed of the frame,and is operatively and adjustably connected With a feed-rocker, thelatter being connected with the main feed-bar which is formed with ayoke embracing a feed-lift eccentric on the driving shaft. The auxiliaryfeed-dog is carried by a secondary feed-bar which also has an adjustableconnection with the feed-rocker and which is provided with suitableconnections with a feed-lift eccentric on the driving shaft.

Clamped upon the presser-bar is a carrier for a resser-foot adapted tocoact with the main eed-dog, and pivotally mounted u on the carrier isan auxiliary presseroot adapted to coact with the auxiliary feeddog. Theauxiliary presser-foot is normally maintained in operative relation withthe auxiliary feed-dog by means of a spring suitably supported by thePresser-foot carrier. A cam-lever mounted upon the carrier is so relatedto a projecting lug of the auxiliary presser-foot that, on depression ofthe cam-lever the auxiliary resser-foot is rocked on its pivot andraised above the auxiliary feed-dog, so that the latter reciprocatesidly below the work. For convenience of operation, especially while themachine is running, a treadle device may be applied to the cam-lever.

In the drawings, Figure 1 is a front elevat1on of my improvements asapplied to a sewing machine frame indicated in dotted lines. Figs. 2 and3 are perspective views of the auxiliary presser-foot and cam-lever andFigs. 4 and 5 are perspective views of the resser-foot carrier and mainpresserfoot respectively. Fig. 6 illustrates a modification of theimprovements, in which an extension of the presser-foot shank forms theoperating lever.

The differential feeding mechanism illustrated in the drawing is notclaimed specifically herein and any differential feeding mechanismcomprising two independent feed-dogs maybe employed. In the said figure,the dotted lines indicate the bed A of a sewing machine, two uprightsupports a, a rising from the bed to support the workplate, which is notillustrated, and a laterally projecting bearing-support b for therock-shaft 1 of a feed-rocker comprising the arms 2, 2 and 3 fixed uponsaid shaft. The depending arm 3 is provided at its end with an apertureto receive the stud 4 clamped within an aperture formed in the end of apitman 5 provided with a strap 6 embracing an actuating eccentric 7 onthe main shaft 8, the said eccentric being adjustable, if desired, inthe well-known manner. To the upper end of the rocker arm 2* isconnected, by means of stud 9 and set-screw 10, the outer end of themain feed-barll which, at its opposite end, is provided with a dependingyoke'll embracing a feed-lift eccentric 12 on the main-shaft 8. Thesubstantial'ly vertical auxiliary feed-bar 13 is formed intermediate itslength with an aperture adapted to receive a stud 14 clamped Within asuitable aperture formed in a swinging link 15 carried by a rock-shaft16 journaled Within suitable bearing apertures formed in the frame. Asuitable auxiliary feed-lift eccentric on the main shaft 8 is embracedby a yoke-arm 17 clamped upon 100 auxiliary feed-bar from the arm 2 ofthe 105 feed-rocker. To this end said arm is provided with alongitudinal slot 8 adapted to receive a slide-pin 18 clamped within oneend of a 1ink-bar 19 which bar, at its opposite end, is pivotallyconnected at 20 with no the lower end of the auxiliary bar. It will beseen that adjustment of the slide-pin Within slot 8 of the rocker willmove arm 19 toward and from the axis of movement of the rocker andthereby cause the feeding movements imparted to the auxiliary feedbar tobe varied in greater or less degree.

The auxiliary feed-dog 21 carried at the upper end of the auxiliary baris of the usual form, being provided with a shank 21 fitted within arecess or seat formed in the bar and secured in position by means of thescrew 22. The main feed-dog 23 also is of a known construction and isprovided with a depending shank 23 which fits within a lateral openingslot or seat formed in the main feed-bar 11, being secured within saidseat by means of the screw 24.

. The head B overhanging the bed-plate supports, as customary, theneedle-bar 25 and presser-bar 26. Upon the presser-bar is clamped thepresser-foot carrier 27 formed with the ribs 27 X which embrace theflattened lower sides of the resser-bar, the carrier being formed alsowith the slot 28 WlllCh receives fastening screw 28 by means of whichthe carrier is secured for vertical adjustment upon the resser-bar.presser-foot 29 is formed with the upwardly extending apertured lugs 30embracing the carrier and pivotally connected thereto by means of pin31. The auxiliary resser-foot 32 is pivotally connected tothe carrier at34 and is formed with a laterally extending shank 33 having an upwardlyprojecting lug 33*. A coiled spring fitted within a boss 35 of thecarrier rests upon the upper edge of the auxiliary presser-foot shankand serves normally to press the auxiliary foot downwardly into contactwith the work,

the spring being engaged at its upper end,

by a stop pin 37 held in adjusted position within the boss by means of aset-screw 38.

A guiding-stud 39 supported by the carrier and passing through a slot 40formed in the shank of the auxiliary foot aids to prevent lateraldeflection of the latter, as shown in Fi 1. y

.T t will be understood from the foregoing that the auxiliarypresser-foot is capable of upward movement a ainst the pressure ofspring 36, without affecting the position of the main presser-foot 29,and that the elevation of the auxiliary foot will relieve the materialoverlying the auxiliary dog from pressure, the latter meanwhilereciprocating idly. A cam-lever 40 may be emlployed to raise theauxiliary presser-foot. n Fig. 1, the cam-lever is shown fulcrumed at 41upon the carrier 27 and provided .with a cam-surface 42- which, when thelever is depressed serves to engage thelug 33 of the auxiliarypresser-foot shank so that the lat ter maybe rocked upon its pivot 34 tolift the auxiliary dog. The lever 49 may be The main inseam manipulatedduring the running of the machine to instantly arrest the effectiveaction of the auxiliary dog, and for convenience in operation atreadle-device, indicated at 43, may be connected to the end of thelever to act in opposition to a spring 44 interposed between the leverand a fixed member such as the bracket 45 on the machine head 6.

In some instances it may be found desirable to extend the shank of theauxiliary resser-foot so that it may be manipulated directly, by hand orthrough the instrumentality of a treadle-device. The presser mechanismas thus modified is illustrated in Fig. 6 of the drawings. As shown insaid figure, the shank of the auxiliary presser-foot is extended to formthe lever-arm 40 which is v invention, what I claim herein is 1. In asewing machine, the combination with feeding mechanism, comprising amain feedmember, an auxiliary feed-member, and actuating means therefor,of main and auxiliary presser-members arranged to cooperate with saidmain and auxiliary feed members, respectively, a carrier common to bothof said presser-members, a spring sup- 100 ported by said carrier andacting upon the auxiliary resser-member, and means for 3. In a sewingmachine, the combination 115 with differential feeding mechanismcomprising main and auxiliary feeding members and actuating meanstherefor, of a resser-foot mechanism consisting of a presser-bar, acarrier supported thereby, 120

mainand auxiliary feet supported by the carrier .in line with each otherand cooperating with said feeding members, a spring carried by thecarrier and acting u on the auxiliary foot, and'means for raising the125 auxiliary foot from its cooperative relation with the auxiliaryfeeding member independently of the main foot whereby the difierentialfeeding action may be suspended.

raising the auxiliary Presser-member with- I Laeoma 4. In a sewingmachine, the combination with differential feeding mechanism comprisingmain and auxiliary feeding members and actuating means therefor, of apresser-foot mechanism consisting of a presser-bar, a carrier supportedthereby, main and, auxiliary feet with flat work-engaging surfacespivotally supported by the carrier, said feet being in line andcooperatively arranged with relation to the feeding members, a springmounted in said carrier and acting 'upon the auxiliary foot, and meansfor raising the auxiliary foot whereby the diflerential feeding actionmay be suspended.

5. In a sewing machine, the combination with differential feedingmechanism comprising main and auxiliary feeding members and actuatingmeans therefor, of a presser-foot mechanism consisting of a presser-bar,a carrier supported thereby, main and auxiliary feet pivotally supportedby the carrier in cooperative relation to the feeding members, a springfor yieldingly pressing the auxiliary foot toward the auxiliary feedingmember, and manual means for raising the auxiliary foot in opposition tosaid spring including a treadle operated cam-lever for engaging andswinging said auxiliary foot about its pivot.

6. In a sewing machine, the combination with differential feedingmechanism comprising main and auxiliary feeding members and actuatingmeans therefor, of a presser-foot mechanism consisting of a Presser-bar,a carrier supported thereby, main and auxiliary feet pivotally supportedby the carrier in cooperative relation to the feeding members, a springfor yieldingly pressing the auxiliary foot toward the auxiliary feedingmember, manua means for raising the auxiliary foot in opposition to saidspring including a treadle operated cam-lever for engaging and swingingsaid auxiliary foot about its pivot, and a second spring normallyholding said treadle operated cam-lever in a position out of liftingrelationwith said auxiliary foot.

7. A presser device comprising a carrier, a main pressenfoot sustainedby said carrier, an auxiliary Presser-foot pivotally connected to thecarrier, said carrier being provided with a socket, a spring adjustablyarranged within said socket, and a lifting de vice for said auxiliarypresser-foot for moving the same relatively to the carrier and withoutaffecting the main presser-foot.

8 In a sewing machine, a presser-bar, a main resser-foot carried by saidbar, an auxiliary presser-foot pivotally connected to said bar andhaving a work-engaging portion arranged in advance of said mainpresser-foot, an arm on said auxiliary foot, a spring yieldinglypressing the auxiliary foot downwardly, and lifting means for raisingsaid auxilairy foot including a manually operable cam-lever pivotallyconnected to said presser-bar whereby the auxiliary foot may be liftedindependently of the main presser-foot.

In testimony whereof, I have signed my name to this specification.

MARTIN HEMLEB.

